Earth is divided into 24 standard time zones because and whats is the result of the sun being right over the equator on march 21?

Earth is divided into 24 standard time zones because the different parts of Earth enter and exit daylight at different times. To compensate with this difference in daylight vs time at specific region time zones are created.  

When the sun is at right over the equator it creates an equal half of daylight and darkness, this phenomenon is called as the “equinox”.

Hope this answer will be a good help for you.

 

Ithink the answer to that would be b):